[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.501386] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.759458] random: sshd: uninitialized urandom read (32 bytes read) [ 20.132519] random: sshd: uninitialized urandom read (32 bytes read) [ 20.616320] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 26.239028] urandom_read: 1 callbacks suppressed [ 26.239031] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.320244] BUG: unable to handle kernel paging request at ffffeafff90f0020 [ 26.327611] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.333870] PGD 0 [ 26.335817] [ 26.337434] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.341901] Dumping ftrace buffer: [ 26.345415] (ftrace buffer empty) [ 26.349098] Modules linked in: [ 26.352391] CPU: 1 PID: 3798 Comm: syz-executor587 Not tainted 4.9.122-g54068d6 #26 [ 26.360159] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.369567] task: ffff8801b79c6000 task.stack: ffff8801c04e8000 [ 26.375612] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.384351] RSP: 0018:ffff8801c04ef948 EFLAGS: 00010246 [ 26.389779] RAX: dffffc0000000000 RBX: ffffeafff90f0000 RCX: 0000000000000000 [ 26.397026] RDX: 1ffffd5fff21e004 RSI: ffffffff814f5918 RDI: ffffeafff90f0000 [ 26.404271] RBP: ffff8801c04ef970 R08: 0000000000034000 R09: 0000000000000001 [ 26.411514] R10: ffff8801b79c6000 R11: 0000000000000001 R12: ffff8801c04efc08 [ 26.418759] R13: ffffeafff90f0020 R14: ffffeafff90f0000 R15: 0000000000000001 [ 26.426004] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.434202] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.440062] CR2: ffffeafff90f0020 CR3: 00000001b7e1e000 CR4: 00000000001606f0 [ 26.447320] Stack: [ 26.449443] ffffeafff90f0020 ffff8801c04efc08 ffff8801b7e97800 ffffeafff90f0000 [ 26.457454] ffff8801b65aac60 ffff8801c04ef9c8 ffffffff8154cb8f ffff8801c04efc18 [ 26.465443] ffff8801c04efc10 ffff8801c04efc88 00003ffe43c001e0 00000001b7e97000 [ 26.473441] Call Trace: [ 26.476046] [] zap_huge_pmd+0x16f/0x860 [ 26.481769] [] unmap_page_range+0x12ad/0x1730 [ 26.487889] [] ? vm_normal_page_pmd+0x310/0x310 [ 26.494185] [] unmap_single_vma+0x101/0x260 [ 26.500136] [] unmap_vmas+0x102/0x1d0 [ 26.505561] [] exit_mmap+0x214/0x3f0 [ 26.510900] [] ? SyS_munmap+0xa0/0xa0 [ 26.516324] [] ? up_write+0x1a/0x60 [ 26.521579] [] mmput+0xf3/0x2d0 [ 26.526483] [] do_exit+0x906/0x27b0 [ 26.531734] [] ? release_task.part.19+0x1210/0x1210 [ 26.538380] [] ? up_write+0x1a/0x60 [ 26.543638] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.549797] [] ? mprotect_fixup+0x930/0x930 [ 26.555744] [] do_group_exit+0x111/0x340 [ 26.561426] [] ? do_group_exit+0x340/0x340 [ 26.567282] [] SyS_exit_group+0x1d/0x20 [ 26.572882] [] do_syscall_64+0x1a6/0x490 [ 26.578569] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.585463] Code: 55 41 54 53 48 89 fb e8 58 b4 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 23 b4 e6 [ 26.612394] RIP [] page_remove_rmap+0x37/0x6d0 [ 26.618719] RSP [ 26.622318] CR2: ffffeafff90f0020 [ 26.625746] ---[ end trace 0c9c3cd03653fdd6 ]--- [ 26.630471] Kernel panic - not syncing: Fatal exception [ 26.636185] Dumping ftrace buffer: [ 26.639708] (ftrace buffer empty) [ 26.643394] Kernel Offset: disabled [ 26.646993] Rebooting in 86400 seconds..